Should they still be quite perky with Ich ?

Yes, they can still be perky.

They're still feeding and interested in everything, and will come to you.
Maybe Carp Pox ?

I've never seen a goldfish with Carp Pox and they (CP & Ich) are so
different from each other that you wouldn't confuse the two. Carp Pox looks
like a wart, whereas ich looks like the fish has been seasoned with a
sprinkling of salt.

I was surprised to see whatever it is ,as water quality is good, filtered,
and UV sterilized
Peter

What has your weather been like over the last week? ~ jan

~Power to the Porg, Flow On!~